George Gao, director-general of the Chinese Center for Disease Control and Prevention, this week said the 'big mistake' in the US and Europe was that 'people aren't wearing masks'.
He told Science magazine: 'This virus is transmitted by droplets and close contact. Droplets play a very important role – you've got to wear a mask, because when you speak, there are always droplets coming out of your mouth.
'Many people have asymptomatic or pre-symptomatic infections. If they are wearing face masks, it can prevent droplets that carry the virus from escaping and infecting others.'
He told Science magazine: 'This virus is transmitted by droplets and close contact. Droplets play a very important role – you've got to wear a mask, because when you speak, there are always droplets coming out of your mouth.
'Many people have asymptomatic or pre-symptomatic infections. If they are wearing face masks, it can prevent droplets that carry the virus from escaping and infecting others.'